UCC2818DW Equivalent & Substitute Parts

Part Overview

The UCC2818DW is a Power Factor Correction (PFC) controller IC manufactured by Texas Instruments, designed for average current mode operation across a switching frequency range of 6kHz to 220kHz. This 16-SOIC surface mount device operates from a 12V to 17V supply and is classified as Last Time Buy, indicating end-of-life status. Due to its discontinued product status, identifying functionally compatible substitute components is essential for design continuity and procurement planning.

Substiute Parts

UCC2818DW

Texas InstrumentsIn Stock: 5404UCC2818DW Datasheet

Current PartRFQ

UCC28180DR

Texas InstrumentsIn Stock: 25251UCC28180DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the UCC2818DW is determined by compatibility across the following critical parameters:

Functional Mode Compatibility: The UCC2818DW operates in average current mode. The UCC28180DR operates in Continuous Conduction (CCM) mode, representing a different control topology. While both are PFC controllers from Texas Instruments, the operational mode difference requires circuit-level evaluation.

Supply Voltage Range: The UCC2818DW requires 12V ~ 17V supply. The UCC28180DR operates at 21V supply, which falls outside the original specification range.

Switching Frequency Range: The UCC2818DW supports 6kHz ~ 220kHz. The UCC28180DR supports 18kHz ~ 250kHz, with partial overlap in the 18kHz ~ 220kHz range.

Package Compatibility: The UCC2818DW uses 16-SOIC packaging (7.50mm width). The UCC28180DR uses 8-SOIC packaging (3.90mm width), requiring PCB layout modifications.

Operating Temperature Range: The UCC2818DW operates -40°C ~ 85°C. The UCC28180DR extends to -40°C ~ 125°C, providing broader temperature coverage.

Regulatory Compliance: Both devices are ROHS3 compliant and REACH unaffected, meeting equivalent environmental standards.

Parameter Comparison

Engineering Selection Recommendations

The UCC28180DR is listed as the manufacturer-recommended substitute for the UCC2818DW. However, direct substitution requires design verification due to the following factors:

Control Mode Difference: The shift from average current mode to Continuous Conduction (CCM) mode alters the control loop characteristics and requires validation of loop stability and harmonic performance in the target application.

Supply Voltage Specification: The UCC28180DR specifies 21V supply, which exceeds the UCC2818DW's 12V ~ 17V range. Circuit design must confirm that the higher supply voltage specification does not create incompatibility with existing power supply architecture.

Package Transition: Migration from 16-SOIC to 8-SOIC requires PCB layout redesign and component placement modifications.

Regulatory Alignment: Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring equivalent environmental and regulatory standing.

Product Lifecycle: The UCC28180DR carries Active product status, providing long-term availability and supply chain stability compared to the Last Time Buy status of the UCC2818DW.

Frequently Asked Questions (FAQ)

Q: Can the UCC28180DR be used as a direct pin-for-pin replacement for the UCC2818DW?

A: No. The UCC28180DR uses 8-SOIC packaging versus the 16-SOIC of the UCC2818DW, requiring PCB layout modifications. Additionally, the control mode differs (CCM versus average current), necessitating circuit-level evaluation.

Q: What is the primary difference between average current mode and Continuous Conduction (CCM) mode?

A: Average current mode and CCM represent different PFC control topologies. The UCC2818DW uses average current control, while the UCC28180DR uses CCM. These modes have different loop dynamics and harmonic performance characteristics that must be validated for the specific application.

Q: Is the UCC28180DR compatible with the 12V ~ 17V supply range of the original design?

A: The UCC28180DR specifies 21V supply operation. While it may function at lower voltages, operation outside the specified range requires engineering validation and is not guaranteed by the manufacturer specification.

Q: What are the implications of the package size difference?

A: The UCC28180DR's 8-SOIC package (3.90mm width) is significantly smaller than the 16-SOIC package (7.50mm width) of the UCC2818DW. This requires PCB redesign, component repositioning, and potential changes to thermal management considerations.

Q: Are both devices compliant with current environmental regulations?

A: Yes. Both the UCC2818DW and UCC28180DR are ROHS3 compliant and REACH unaffected, meeting equivalent environmental and regulatory requirements.

Q: What is the advantage of the UCC28180DR's extended operating temperature range?

A: The UCC28180DR supports -40°C ~ 125°C operation compared to the UCC2818DW's -40°C ~ 85°C range. This provides broader thermal coverage for applications requiring extended temperature performance.

Q: Why is the UCC28180DR recommended as a substitute if it has different specifications?

A: The UCC28180DR is the manufacturer-recommended alternative for end-of-life management of the UCC2818DW. Substitution is feasible for applications where the control mode transition, supply voltage specification, and package change can be accommodated through design modification and validation.